Two Computers for backup

Hi,
Just want to know that I have 2 computers One at office and one at home, Can use the same device on both the computer on i tunes, for sync, backup and buying apps.
An urgent reply in this regard will be highly appreciated.

All iTunes content on your iPhone - all music, movies, tv shows, and 3rd party apps should be in your iTunes library on your computer. Your iTunes library should be included with your computer's backup stored on an external drive or some other external media used for backup purposes only along with all other important data on your computer such as documents, photos, etc.
Backing up your iTunes library per the simple instructions included with this link and transferring the backup to a new or different computer along with the new or different computer being authorized with the same iTunes account will prevent any iTunes content from being erased from your iPhone with the first sync with iTunes on the new or different computer.
http://support.apple.com/kb/HT1751

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